Question

ayuden por favor esta difícil

Answer 1

7.-
13 6/7 = 13 + (6/7) = (91/7) + (6/7) = 97/7
19 3/4 = 19 + (3/4) = (76/4) + (3/4) = 79/4

(2*97/7) + (1*79/4) = (194/7) + (79/4) = (776/28) + (553/28) = 1329/28
1329/28 = (1316/28) + (13/28) = 47 + (13/28) = 47 13/28

Lorena necesita:
47 13/28 metros de tela


8.-
5 3/8 = 5 + (3/8) = (40/8) + (3/8) = 43/8
7 2/3 = 7 + (2/3) = (21/3) + (2/3) = 23/3
9 3/4 = 9 + (3/4) = (36/4) + (3/4) = 39/4

(43/8) + (23/3) + (39/4) = (129/24) + (184/24) + (234/24) = 547/24
547/24 = (528/24) + (19/24) = 22 + (19/24) = 22 19/24

La longitud total de la madera es;
22 19/24 pies


9.-
3 5/6 = 3 + (5/6) = (18/6)+(5/6) = 23/6
9 5/9 = 9 + (5/9) = (81/9)+(5/9) = 86/9

(2*23/6) + (4*86/9) = (46/6) + (344/9) = (138/18) + (688/18) = 826/18
826/18 = (810/18) + (16/18) = 45 + (8/9) = 45 8/9
Si considerar la longitud perdida debida al cortamiento,
la longitud minima. de la plancha de latón, que requiere Tania Gisti es de:
45 8/9 metros pulgadas de ancho